Well, my Morteans are also "humans", so are SgtEasy's Kriegs.
Aliens whose evolution was strikingly similar to humans.
There's always a method to include "human" factions without relying on the good'ol Earth.
Also[@Keyguyperson]'s Abh is noted to be originating from the humans on Earth, from the distant past.
So I don't know what he's on about.